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【单选题】
多级放大电路的电压放大倍数为各级电压放大倍数的 。A.
相加
B.
平方
C.
乘积
D.
相减
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反馈参考答案：
举一反三
【多选题】I presume that they are tired after a long ride. I assume that all of you will pass the CET-4 this year. What`s the difference between presume and assume ?
A.
To use assume, the assumption is usually based on reasonbale evidence.
B.
To use presume, the presumption is usually based on reasonbale evidence.
C.
To use assume, the assumption usually takes for granted.
D.
To use presume, the presumption usually takes something as true.
E.
To use assume, the assumption usually takes something as true.
F.
To use assume, the assumption is usually based on little or no evidence.
【简答题】assume I assume
that is only a matter of time.A. 认为 B. 怀疑 C. 接受 D. 认可
【单选题】()是指航空公司确定的服务宗旨、价值、服务精神、服务意识、对乘客价值认知的总和,体现在乘客服务过程中企业服务行为的价值取向。
A.
服务文化
B.
空乘服务文化
C.
空乘服务目标
【单选题】在SQL的下列语句中,能够实现参照完整性约束的语句是( )
A.
foreign key
B.
primary key
C.
references
D.
foreign key 和 references
【单选题】在SQL的下列语句中,能够实现参照完整性约束的语句( )。
A.
FOREIGN KEY
B.
PRIMARY KEY
C.
REFERENCES
D.
FOREIGN KEY 和REFERENCES
【简答题】I assume that we _ _ _ by nine.
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